This Listing is for a case of TWENTY FOUR (24). BRAND NEW, IN ORIGINAL PACKAGING (when applicable). AO Smith Whole House Replacement Filters AO-WH-PRE-RPP2 (1074309). Filter for use with: Whole House Sediment Filter (AO-WH-PREV or AO-WH-PRE). Longer lasting appliances – whole house filter system designed to reduce sediment from every tap. 20 micron filtration – reduces sediment smaller than the human eye can see. Use only certified, genuine A. Smith replacement filters for continued contaminant removal and system performance. Replacements made easy – no plumber necessary. Replace filter every 3 months. Standard capacity (2.5) filter is perfect for household sizes of 1-4 people. It’s the cheapest here and you will get it the fastest from me! Please DO NOT assume this item will come with anything that is not described nor shown in photos. Please look carefully at ALL photos before purchasing. We are more than happy to answer any and all questions you may have.